Extremely rich, runs Bad
11-17-03, 01:13 PM
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Extremely rich, runs Bad
To understand my current situation we have to go back to around three weeks ago when I decided to take my UIM off to clean up some wires. I took off the UIM and set the throttle cable down. The cable touched the main power wire coming off the alternator and sparked and bured through. (I was going to disconnect the battery before snipping the wires.) I thought i had taped this up very well because i had seen this type of thing happen before and wanted to avoid it (oh well too late now). So my throttle cable is toast. I then continued to take off my UIM. I smelled gas so I started to investigate. My Fuel Pulsation Dampener was leaking out the top of it. One more thing to order from Mazda.
I ordered my parts from Mazda and they will be here in a few days. I thought I would use this time to install my DEFI D-series Fuel Pressure Gauge. After a few trips to Home Depot i got it sorted out. The throttle cable and the FPD came in and I installed both of those without any problems. I primed the fuel system and went to start it.
When I started the car it runs extremely rich and vaporized fuel spews out the tail pipe. It sounds like it is running on one rotor. When i run it for a long time the inside of my tail pipe glows red, which is frightening.
Now its time to think. What could be the problem. My engine is very new and I broke it in properly. It was running fine the last time i drove it. I also thought my plugs were fouled from sitting so long. I changed those. It runs the same. Maybe one of my ignitions coils is bad. I tested for spark on all 4 and it was good on all of them. Somehow i thought putting in the Fuel Pressure Gauge in the line might have effected it. I swaped it out for the original line and had no change. I tried messing with the A/F screws and it helped a little but still did nothing. I moved the car the other day and didnt let it warm up enough so now it is sitting in the garrage flooded. I pulled the trailing plugs and cranked with WOT for 20 seconds. I repeated this a few times. It acted like it allmost wanted to start but it didnt. I got frustrated and had to walk away.
This is where i'm at right now. I would really appreciate some advice or some suggestions on where I should go from here. Thanks.
I ordered my parts from Mazda and they will be here in a few days. I thought I would use this time to install my DEFI D-series Fuel Pressure Gauge. After a few trips to Home Depot i got it sorted out. The throttle cable and the FPD came in and I installed both of those without any problems. I primed the fuel system and went to start it.
When I started the car it runs extremely rich and vaporized fuel spews out the tail pipe. It sounds like it is running on one rotor. When i run it for a long time the inside of my tail pipe glows red, which is frightening.
Now its time to think. What could be the problem. My engine is very new and I broke it in properly. It was running fine the last time i drove it. I also thought my plugs were fouled from sitting so long. I changed those. It runs the same. Maybe one of my ignitions coils is bad. I tested for spark on all 4 and it was good on all of them. Somehow i thought putting in the Fuel Pressure Gauge in the line might have effected it. I swaped it out for the original line and had no change. I tried messing with the A/F screws and it helped a little but still did nothing. I moved the car the other day and didnt let it warm up enough so now it is sitting in the garrage flooded. I pulled the trailing plugs and cranked with WOT for 20 seconds. I repeated this a few times. It acted like it allmost wanted to start but it didnt. I got frustrated and had to walk away.
This is where i'm at right now. I would really appreciate some advice or some suggestions on where I should go from here. Thanks.
11-17-03, 03:32 PM
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It is hooked up correctly. Is there any other way I can test it to see if its working? Or, is my only alternative to replace it and hope for the best?
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11-18-03, 01:29 PM
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It almost sounds like it was flooded to begin with. I'd say start it (either ATF or push start) and let it run until it warms up and see if the symptoms dissapear. I can't imagine anything you'd have done would have had any affect on the engine. You can't blow an apex seal with an arc, at least I don't think so 
11-18-03, 01:38 PM
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Beleive me I ran it for an hour or two on more than one occasion. I drove it around and let it warm up completely. The exhaust tip started to glow red and sother things started to scare me a little so i shut it down.
Maybe the PFC is fried? Would replacing it with my stock computer let me know if it was?
Maybe the PFC is fried? Would replacing it with my stock computer let me know if it was?
11-18-03, 01:45 PM
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Originally posted by cowsniperRX7
Beleive me I ran it for an hour or two on more than one occasion. I drove it around and let it warm up completely. The exhaust tip started to glow red and sother things started to scare me a little so i shut it down.
Maybe the PFC is fried? Would replacing it with my stock computer let me know if it was?
Beleive me I ran it for an hour or two on more than one occasion. I drove it around and let it warm up completely. The exhaust tip started to glow red and sother things started to scare me a little so i shut it down.
Maybe the PFC is fried? Would replacing it with my stock computer let me know if it was?
How modded is your car? If it'll be safe to run it with the stock ecu (i.e. stock boost levels, seq twins) then that would be a good test to try. It could have shorted out the PFC when the throttle cable arced.
11-18-03, 01:57 PM
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Originally posted by cowsniperRX7
HAHA if Eric ever gives it back!
HAHA if Eric ever gives it back!
11-18-03, 01:57 PM
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Originally posted by cowsniperRX7
TO4S,
TO4S,
11-18-03, 02:00 PM
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Originally posted by 911GT2
Yikes. I wouldn't put the stock ECU in with a single in their. But maybe if it's just to start and idle it it'd be ok? Not sure, I'd talk to someone with a single turbo first just to see if it's ok.
Yikes. I wouldn't put the stock ECU in with a single in their. But maybe if it's just to start and idle it it'd be ok? Not sure, I'd talk to someone with a single turbo first just to see if it's ok.
11-18-03, 02:01 PM
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Originally posted by 911GT2
Yikes. I wouldn't put the stock ECU in with a single in their. But maybe if it's just to start and idle it it'd be ok? Not sure, I'd talk to someone with a single turbo first just to see if it's ok.
Yikes. I wouldn't put the stock ECU in with a single in their. But maybe if it's just to start and idle it it'd be ok? Not sure, I'd talk to someone with a single turbo first just to see if it's ok.
Might even go into limp... But it should still diagnose the ECU.
11-18-03, 02:05 PM
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Originally posted by cowsniperRX7
It is hooked up correctly. Is there any other way I can test it to see if its working? Or, is my only alternative to replace it and hope for the best?
It is hooked up correctly. Is there any other way I can test it to see if its working? Or, is my only alternative to replace it and hope for the best?
11-18-03, 02:35 PM
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Originally posted by RB25DET1996240SX
dude u need an aftermarket fuel pressure regulator. same problem im having i just need to figure out how to tap it in
dude u need an aftermarket fuel pressure regulator. same problem im having i just need to figure out how to tap it in
11-18-03, 02:37 PM
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i agree that you need to change out the PFC for someone elses PFC or for another ECU if thats still safe.
If that doesn't work and if you REALLY think its just the engine running rich, as a TEMPorary test, trying taking the PIM setting for 1000rpms down to like 85% or something and see if that helps lean it out enough to fix things. HOWEVER, considering how HOT it was running with the glowing tailpipe, etc., its probably NOT running rich and you probably DON'T want to lean it out, but the PIM voltages are an easy quick fix for a very rich idle if thats definitely your problem.
-Rob
If that doesn't work and if you REALLY think its just the engine running rich, as a TEMPorary test, trying taking the PIM setting for 1000rpms down to like 85% or something and see if that helps lean it out enough to fix things. HOWEVER, considering how HOT it was running with the glowing tailpipe, etc., its probably NOT running rich and you probably DON'T want to lean it out, but the PIM voltages are an easy quick fix for a very rich idle if thats definitely your problem.
-Rob
11-24-03, 02:00 PM
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I'm going to sound like a dumb-*** for relating this, but when I did my single conversion, I mistakenly attached the map sensor vacuum line to what felt like a UIM vacuum nipple, but was actually a rod from the throttle body butterfly. What can I say--it was 3 am and I had been working on the car for 8 hours.
Anyway, double check where on the UIM you have your map sensor vacuum line attached.
Anyway, double check where on the UIM you have your map sensor vacuum line attached.
11-27-03, 11:55 AM
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Ok i found something new. The Load on my maps for the PFC does not change. I have no idea what could cause this. Any ideas?
Here is the thread in the PFC section: https://www.rx7club.com/showthread.p...hreadid=246114
Here is the thread in the PFC section: https://www.rx7club.com/showthread.p...hreadid=246114
11-27-03, 01:10 PM
#25
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Re: Extremely rich, runs Bad
maybe its this 
Originally posted by cowsniperRX7
. ...The cable touched the main power wire coming off the alternator and sparked and bured through. (I was going to disconnect the battery before snipping the wires.) I thought i had taped this up very well because i had seen this type of thing happen before and wanted to avoid it (oh well too late now)...
.
. ...The cable touched the main power wire coming off the alternator and sparked and bured through. (I was going to disconnect the battery before snipping the wires.) I thought i had taped this up very well because i had seen this type of thing happen before and wanted to avoid it (oh well too late now)...
.